| 摘要 |
PURPOSE:To decrease the generation of flaws in an information recording part and the quantity of recording and to prevent imperfect wiping at the time of cleaning by providing projecting parts to the position slightly apart from the information recording part in the non-information recording part on the outer or inner side of the information recording part. CONSTITUTION:The projecting parts 4a are provided to the positions apart from the information recording part 2 within the non-information recording part 6 existing on the outer side of the information recording part 2 around a central hole 3 of the recording medium 1. The direct contact of the recording part 2 with a desk, etc., is obviated in this way even if the recording medium 1 is placed by positioning the recording surface thereof so as to face downward. Since the projecting parts 4a exist in the position apart from the information recording part 2, the generation of the imperfect wiping at the time of cleaning is obviated. |
